1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e2d9279b96ba1b623463ee4937419e46a5e84dd3829a1aa83baf82136dd26c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7876c89-4547-4e5e-bafe-04a341040687.json and https://artists.proofprofile.net/proofs/artist/a7876c89-4547-4e5e-bafe-04a341040687.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa214fc2ce6baeb02febeac0234dd11b3b16f47fbdc8f4df4842556fab116b284. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a902ecb2258be77122d4d9d7203bb420bab6a1574307bab08698e8b56aa9447. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:39:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b85e98b2910c8f321e40682c1d05b93d5211dc26debd758eb70e18b5cb4f92. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67096445009a9139b5359b490155b8f79830614ebd784c145f1ca10804974ce3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1eb3d6a1399e01b51ca6e319c42a342aed4c141f7ab7559112f016399ceb27f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:53:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c63bb1f87432ea3f52451b0a8c4784cf762b5a0cd01cd38ea0a966ffe92635. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a7b9f65f60bc54cad90002249c8b096f39f20e3dda275f0d6424741866093d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67c3a0d685b148762884b27d31879061bb732788223c592cc4dda96069ef6ef. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1419714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af2f840e86d4b254355df8effb68916c2675a984d33a4b86845c8f037d32fb7. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5011b4c8622eadfa0fd90319a6b8a7c44e9a37913f4834524758f9535c9f2b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6522d1ce897880ee62d63989d3addf324341a18a9d8df88acc4b549b5ed3d49. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edd3b018f0d83eeb7cb72021dee071b98d12f2629dd886df81ca9a8a9dc0fa6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd771c1db4a710e8cc6b42b31009fd3ed16c07d457612c59e88bc65b34770654c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fd7154c1ff0af534d473c379dfb6cf0fe478ac45500203ece8f9391f2db855. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac5b4a141b383bd95c8e59bb83a650b81742354bafb67694528db3cc7fa26a1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc739cafd32cdee3d3ed506eaa941da3ff43d74a291918164868719f77c04c8c0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX9P1130067.